426 ORDER 159. FILICES. 



1 A. acrosticlioides Swtz. Frond narrow-lanceolate, 15 18'; stipe chaffy; pn. 



falcate-lanceolate, ciliate-serrulate, 1 2', auriculate on the upper side at base, the np- 

 per covered with fruit, smaller than the sterile. Rocky shades. Common. 

 |3. incixum. Segments incised and sharp-toothed, most of them fertile. N. Y.. &c. 



2 A. IjOiichitis Sw. Frond linear-lanceolate, rigidly erect., 8 IS': pn. triangular- 



ovate, auricled on the upper side at base, longest (!') in the middle, gradually les- 

 sened to apex and base, all densely fertile. Lake Superior, and N. 



8 A MUNITUM. A splendid Fern from California, growing in clumps, 3 of, smooth, 

 ligid, evergreen, lance-linear; segm. oblong-falcate, spinulou<?-serrate ; son 2-ro\ved. 



4 A, FALCATUM. Frond thick, rich green, lanceolate, pinnate, 2 3f high, with ample, 



lance-acuminate pinnse. A noble, hardy Fern from Japan. 



5 A. Floridaiium (Hook). Rigidly erect, lance-oblong, pinnate and barren below, 



bipinnate, fertile, and contracted above; lower pinnte cut-pinnatifid ; indusia large, 

 round, peltate, as in No. 1. Ga., Fla., La. (A. Ludoviciana C-B.) 



6 A. aculeatum Sw. |3. ISraunii. Fronds in tufts, dark green, 2 3f, pinnate, 



lanceolate, narrowed both ways ; stipe short, shaggy with large scales ; segm. ovate- 

 falcate, auricled on the upper side, bristle-tipped. Mts., Vt. (Eaton), N. Y. 



7 A. PODOPIIYLLUM (or SIEBOLDII). Fronds of two forms, thick, smooth, pinnate, with 



a few large oblong pinnae, in the fertile contracted and covered with sori. China. 



8 A. Tlielypteris Sw. Lady Fern. Frond lance-ovate, 10 16'; pn. narrow, distant, 



deeply pinnatifid, the lowest pair as long as any; margins reflexed in fruit. 



9 A. Novaboraceiise Willd. New York Fern. Frond elliptic-lanceolate, 1218'; 



pn. narrow, gradually shortening from the middle both ways ; 8egm. oblong, obtuse, 

 flat ; sori close to the margin, at length confluent. Moist woods : corn. Delicate. 



10 A. patens Sw. Frond soft and thin, downy with rusty hairs, lance., 12 18' : pn. 

 linear-oblong, pinnatifid ; segm. oblong, obtuse, entire ; sori scattered. Dry, Fla. 



1 1 A. MOI.LE, from S. Afr. and S. Am., is divided just like A. patens, and equally hairy, 

 but is larger, finer, with straw-colored stipes, and the sori in regular marginal rows. 



12 A. cristatum Sw. Frond narrowly lanceolate, some 2fx6'; pn. deeply pinna- 

 tifid, triangular-oblong'or -ovate, acute ; segm. toothed, bearing a single row of large 

 sori each side of the mid-vein. A beautiful dark-green Fern, comv-non in woods. 



13 A. Goldianum Hook. Frond oval or ovate, about ]5xlO', stipe same length ; 

 pri. broad (1 2'), deeply pinnatifid ; segm. subfalcate, crenate. Woods, E. and W. 



14 A. fragrans Sw. Fronds linear-laneeolate, 6 12', tapering both ways, bipinnate ; 

 stipe short, chaffy ; pn. ovate-oblong, 110" ; segm. lin.-oblong, with a dozen round- 

 ish crenatures or lobes ; sori confluent. Rocks, Northern Mich, and Wis. 



15 A. margins-tie Sw. Fern ovate to lance-ovate, thick, glabrous, 1 2f, bipinnate, 

 stipe very chaffy at base ; pn. lanceolate ; segm. oblong-falcate, obtuse and entire at 

 apex, the lower crenate-lobed ; sori round, at or near the margin. Rocky woods. 



16 A. Filix-mas. Fern lanceolate, 1 3f; stipe very chaffy; pn. triangiilar-lancfi. ; 

 segm. oblong, obtuse, serrate at apex; sori near the mid-vein. N. J. to Va. ': X. \v. 



1 7 A. spinulosum Willd. Stipe elongated, soon smooth, the chaff deciduous ; frond 

 1 2f, ovate, acuminate, nearly or quite tripinnate; pinme lanceolate, acuminate, the 

 lower longest ; pnl. oblong, acutish, segm. mucronatc-serrate. Woods and pastures. 



. dilatatutn. Stipe permanently chaffy ; frond triangular-ovate ; pnl. obtuse 

 y. JSootlii. St-pe chaffy; frond oblong-lanceolate ; pnl. rather acute. 



